Give host ResolveAssemblyReference priority over reference paths

The list of assembly files referenced by the template may contain
reference assemblies, which will fail to load. Letting the host attempt
to resolve the assembly first gives it an opportunity to resolve runtime
assemblies.

Ideally we would have a robust mechanism for resolving runtime
assemblies bue this will have to serve as a stopgap.

Mono.TextTemplating/Mono.TextTemplating/CurrentDomainAssemblyResolver.cs

@@ -26,17 +26,20 @@ Assembly ResolveReferencedAssemblies (object sender, ResolveEventArgs args)
 		{
 			var asmName = new AssemblyName (args.Name);
 
+			// The list of assembly files referenced by the template may contain reference assemblies,
+			// which will fail to load. Letting the host attempt to resolve the assembly first
+			// gives it an opportunity to resolve runtime assemblies.
+			var path = resolveAssemblyReference (asmName.Name + ".dll");
+			if (File.Exists (path)) {
+				return Assembly.LoadFrom (path);
+			}
+
 			foreach (var asmFile in assemblyFiles) {
 				if (asmName.Name == Path.GetFileNameWithoutExtension (asmFile)) {
 					return Assembly.LoadFrom (asmFile);
 				}
 			}
 
-			var path = resolveAssemblyReference (asmName.Name + ".dll");
-			if (File.Exists (path)) {
-				return Assembly.LoadFrom (path);
-			}
-
 			return null;
 		}
 

Mono.TextTemplating/Mono.TextTemplating/TemplateAssemblyLoadContext.cs

@@ -96,6 +96,14 @@ protected override Assembly Load (AssemblyName assemblyName)
 
 		Assembly ResolveAssembly (AssemblyLoadContext context, AssemblyName assemblyName)
 		{
+			// The list of assembly files referenced by the template may contain reference assemblies,
+			// which will fail to load. Letting the host attempt to resolve the assembly first
+			// gives it an opportunity to resolve runtime assemblies.
+			var path = host.ResolveAssemblyReference (assemblyName.Name + ".dll");
+			if (File.Exists (path)) {
+				return LoadFromAssemblyPath (path);
+			}
+
 			for (int i = 0; i < templateAssemblyFiles.Length; i++) {
 				var asmFile = templateAssemblyFiles[i];
 				if (asmFile is null) {
@@ -113,11 +121,6 @@ Assembly ResolveAssembly (AssemblyLoadContext context, AssemblyName assemblyName
 				}
 			}
 
-			var path = host.ResolveAssemblyReference (assemblyName.Name + ".dll");
-			if (File.Exists (path)) {
-				return LoadFromAssemblyPath (path);
-			}
-
 			return null;
 		}
 	}